Annealing-box.



F. E. MEST.

ANNBALING B0X.

IPLIUATION FILED MAY l, 1911. l O68 260, Patnted July 22, 1913. 2SHEETS-SHEET l.

INVENTOR @y WM F. E. MESTA.

ANNBALING BOX.

APPLIGATION FILED MAY 1, 1911. 1,068,260.` Patented July 22, 1913.

2 SHEETS-SHEET 2.

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WITNESSES via FREDERICK MESTA, l? PITTSBURGH, PENNSYLVANIA.

NNEALINGt-BOK.

Specification of Letters Patent.

Patented Jnly 22, 1913.

Application filed Hay l, 1911. Serial No. 624x419.

, of annealing box embodying my invention partly brokenjaway; Fig. 2 isa section on the line ll-ll of Fig. l; Fig. 3 1s a side view showing amodilication; andFig. l

y is a cross section showing another modification.

My invention has relation to annealing y boxes,'and is designed toprovide an amicaling box which will be cheaper in construetion and moredurable in service than the annealing boxes heretofore employed.

Prior to my invention, annealing boxes have been constructed either asintegral castings or have been built up of metal plates or sectionsunited in various ways. Owing to the severe heat to which the boxes aresubjected in "use, they rapidly burn out and also tend to warp andcrack. Numerous expedients have been resorted to in the construction ofsuch boxes for overcoming these defects and increasing their durability.

ln accordance with my invention, l construct the box'wholly of aheat-resisting material of initially plastic character capable of beingrmolded into the desired form and suitably reinforced by metal, ifdesired.

ln the embodiment of my invention which l have shown in the aceompanyingdrawings, the box consists of the body 2 of plastic material molded tothe proper thickness and shape over a metallic reinforcement 3.

lln this particular form of my invention, the

metallic reinforcement- 3 consists of sheets of expanded metal suitablyconnected at the corners with a stift'ening and reinforcing rod 4t, nearits lower edge, the plastic material being molded on both sides of thereinforce through the interstices or openings thereof.

Preferably all angles of the box are,

rounded, so as to obviate `sharp corners lilrely to be injured, andincreasing the sti'- ness and durability. rllhe plastic body may bemolded continuously and without seams.

Fi 3 shows a modified form of the inventien in which the box is providedwith a plurality of exterior reinforcing ribs 5. rlhese ribs preferablyextend both vertically and longitudinally of the box, but may bearranged in various ways.

- Fig. l shows a modification in which the exterior of the box isprovided with a corrugated. or ribbed surface 6, the purpose of which isto increase the area of the heatabsorbing Surface of the body. ln thisiig-ure, l have shown the lower edge' of the box as resting in ametallic frame 7 of channel form, 'and which carrles the eyes 8 for thelifting hooks. rlhis channel seats in thev usual box bottom r9.

ln molding the box, pressure may or may not be employed in forcing thematerial into the molds. By the use of hydraulic pressure, a very densestructure may be obtained. Instead of molding the box as one continuouspiece, it will be -obvious that it may be molded in slabs or sectionsand cemented together at the joints.

' may be of any desired or suitable character.

lf metal reinforcement is not employed, the entire box can be formedwithout joints 1 from theplastic material in a suitable mold;

Annealing boxes can be constructed in accordance with my invention at acostgreatly below that of the ordinary metal boxes and of greatlylincreased durability, the boxes being much lighter and'easier to handlethan are the metal boxes commonly employed.

The plastic heat-resisting material which l employ may be of `varylngcompositions. A suitable composition for the purpose is as follows;silica 71.7 parts (by bulk); alumina l1 arts; oxid magnesia 11.6 parts;alkalis (so iu'm and potassium) 2.2 parts; silicon carbid 3.5 parts.These ingredients are thoroughly mixed into a plastic mass of suitableconsistency for molding.

As the plastic material may have an i oxidizing action upon the metal ofthe reinforce, the latter is preferably galvanized or provided with someother sultable protective coating.

ll claim:

l. As a new article of manufacture, an annealing box composed of amolded body of heatresisting cementitious material containing a metallreinforce, substantially as described.

2. An annealing box comprising a metal reinforce and a covering orcoating of cementtious heat-resisting material in which the reinforce isembedded, substantially as described.

3. An annealing box comprising a metallic reinforce and a body moldedupon and embedding the reinforce and composed of an initiallyplasticheat-resisting ma-` ferial, substantially as described.

4. An annealing box comprising a metallic reinforce'and a body moldedupon and embedding the reinforce and composed of an initially plasticheat-resisting materialv Whose main ingredient is silica, substantiallyas described.

5. An annealing boxY having continuous top, side and end Walls of amolded fireresisting cementitious material and containing `a metalreinforce, substantially as described.

6. An annealing box having continuous top, side and end Walls of amolded lireresisting cementitious material and containing a metallicreinforce, said box having its corners or angles rounded, substantiallyasY described.

7. An annealing box having continuous top, side and' end Walls of amolded reresisting cementitious material and containing a metalreinforce, the lower portion of the box having embedded in its walls a'metallic reinforce of substantial cross section, substantially asdescribed.v

8. An annealing box comprising a molded body of heat-resisting materialcontaining a metal reinforce, the latter having a coating to protect itfrom the action of said material, substantially as described.

In testimony whereof, I have hereunto set my hand.

FRED. E. MESTA.

Vitnesses L. IvnRsEN, J, R. BERG.

